CHARGE-EXCHANGE FROM D(N=2) ATOMS TO LOW-Z RECEIVER IONS

To elucidate the influence on charge-exchange Spectroscopy of metastab le deuterium donors, the corresponding cross sections for state-select ive charge transfer have been calculated using the classical trajector y Monte Carlo method. The cross sections for electron capture from D(n = 2) by fully stripped low-Z ions are contrasted with those for captu re from ground state D to indicate the importance of metastable donors . Using the new data, effective emission coefficients for the spectral lines of H-like light impurities used in charge-exchange spectroscopy have been calculated. These results incorporate the presence of excit ed n = 2 donors in the beam and apply to a wide range of neutral deute rium beam energies. For beam energies below approximately 25 keV amu(- 1) a small fraction of D(n = 2) in the beam becomes of importance and at lower energies it even starts to dominate the charge-exchange spect roscopy observations.